The plasma coming off the sun expands through space, along with the sun's magnetic field. Together they form the heliosphere within the surrounding local interstellar medium—the plasma ...

An interstellar probe could travel farther than any previous spacecraft and help scientists get a good look at our heliosphere – the Sun’s influence in space – from the outside.

The Voyager probes are both outside the heliosphere, a protective bubble ... He said both probes had now "made it into interstellar space" and that Voyager 2's date of departure from the Solar ...